now more than 75% of morning drivers use fast track. >>> and solo drivers can now use a toll to use that car pool lane from highway 84 to rule 27. christien kafton reports. >> reporter: commuters got their first chance to try out the new 680 express lane today paying for the privilege of using it. some drivers soon complained that was supposed to be a convenience actually slowed them down. >> i left home at 7:30 this morning. i didn't get to where i needed to go until 9:15. >>> the express toll lane is supposed to reduce congestion between highway 84 from 5:00 in the morning to 8:00 at night solo drivers can now use the toll plaza for a price. caltrans says road work, new signs and the new lane configuration all work to slow traffic. >> there was about five minutes of delay. it was bad because of that merge but the traffic was moving normally. >> reporter: drivers have to have the fast track in position if they're going solo. car poolers need to use a specific mylar bag to shield their transponders. >> take your bag out, pop it in the bag and that will prevent your tag from being read. >